Long power cable for subwoofer

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1311&_nkw=8%2F3+soow&_s...

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SOOW or 300 VAC (J)
Heavy copper and heavy copper ends. Perfect for just what you’re doing.
8/3
10/3

10/4 SOOW make some serious speaker IC. 12K welding machines. (bass amps) :-)
I did 8/4 too, on my bass bins. 20+ pound cables (jumper cables) 40 footers
Concert in the backyard, couple times a year.. Work perfect..Can't hurt them either..

Very flexible.

Gold plated or copper, (I like copper) ends on bass stuff. Twist locks in the back yard..and shops.

You can add armor for next to nothing and some shrink tube.

Two for 50.00 usd. Better than most you can buy.. 5N + copper 99.9%

Retail cost 1-200.00 per 3 meter. 5 meter 2-300.00. Resale X 3 for all the suckers out there or the infirmed (I understand them).

Easy peasy OP..

Regards

After reading this article: https://positive-feedback.com/audio-discourse/subwoofers/,  I replaced the extension cord going to an short Signal Cable power cord I have going into my Martin-Logan BF210 sub with a Signal Cable "extension" cord I had.  Much like the reviewer found, the mids and highs improved with the bass.

Looks like you can buy their 15 ft 10 awg cable for a little over $200.
http://signalcable.com/magicpower.html 

You’ll be just fine with the Monoprice 14 gage, 15 foot power cord. I’m using that exact cable and length for one of my subs as well. It was like 10 bucks.

Build your own. 13AWG is probably heavy enough. I’ve used this wire and it punches well above its price.

https://www.madisoundspeakerstore.com/power-cables/supra-lorad-2.5-power-cable-by-the-foot/

For plugs these are very good for the money.

http://www.soniccraft.com/product_info.php/cardas-3455r-iec-p-2109

http://www.soniccraft.com/product_info.php/cardas-3455r-male-ac-p-2110

Hi dtximages: Patrick Cullen recommends these AC cords to use with SVS subwoofers  https://www.cullencable.com/red-series/   Great company to work with.